There is a lot of research going on in the field of photonics. Some of them are mentioned below:
1. Quantum optics
2. Organic Photonics and Electronics
3. Photonics sensor
4. Optoelectronics
5. Metamaterials
6. Plasmonics
7. Terahertz
8. Solar Energy
9. Laser & LED
10. Spectroscopy
11. Imaging